電解質溶液在表面覆蓋離子可穿透薄膜之微管中的流動(2/3)

The electrokinetic flow of an electrolyte solution in a rectangular microchannel
is investigated theoretically. The present analysis extends previous results in that a
two -dimensional problem is considered and the wall of the microchannel is covered
by an ion-penetrable charged membrane layer; the latter simulates a biological system.
The volumetric flow rate, the total electric current, the electroviscous effect, and the
streaming potential of the system under consideration are evaluated. We show that
the variations of these quantities as a function of the aspect ratio of the microchannel
may have a local minimum or a local maximum at a medium level of ionic strength,
which depends upon the thickness of the membrane layer. Some phenomena, which
are predicted by the corresponding bare -wall model, may not be observed in the
present case. For example, the variation of the electroviscous effect as a function of
the electrokinetic radius may not have a local maximum.